<template>
    <view class="uni-cursor-point">
        <view
            v-if="popMenu && (leftBottom || rightBottom || leftTop || rightTop) && content.length > 0"
            :class="{
                'uni-fab--leftBottom': leftBottom,
                'uni-fab--rightBottom': rightBottom,
                'uni-fab--leftTop': leftTop,
                'uni-fab--rightTop': rightTop
            }"
            class="uni-fab"
        >
            <view
                :class="{
                    'uni-fab__content--left': horizontal === 'left',
                    'uni-fab__content--right': horizontal === 'right',
                    'uni-fab__content--flexDirection': direction === 'vertical',
                    'uni-fab__content--flexDirectionStart': flexDirectionStart,
                    'uni-fab__content--flexDirectionEnd': flexDirectionEnd,
                    'uni-fab__content--other-platform': !isAndroidNvue
                }"
                :style="{ width: boxWidth, height: boxHeight, backgroundColor: styless.backgroundColor }"
                class="uni-fab__content"
                elevation="5"
            >
                <view v-if="flexDirectionStart || horizontalLeft" class="uni-fab__item uni-fab__item--first" />
                <view v-for="(item, index) in content" :key="index" :class="{ 'uni-fab__item--active': isShow }" class="uni-fab__item" @click="_onItemClick(index, item)">
                    <u-icon name="chat" color="#282C35" size="40"></u-icon>
                    <text class="uni-fab__item-text" :style="{ color: item.active ? styless.selectedColor : styless.color }">{{ item.text }}</text>
                </view>
                <view v-if="flexDirectionEnd || horizontalRight" class="uni-fab__item uni-fab__item--first" />
            </view>
        </view>
        <view
            :class="{
                'uni-fab__circle--leftBottom': leftBottom,
                'uni-fab__circle--rightBottom': rightBottom,
                'uni-fab__circle--leftTop': leftTop,
                'uni-fab__circle--rightTop': rightTop,
                'uni-fab__content--other-platform': !isAndroidNvue
            }"
            class="uni-fab__circle uni-fab__plus"
            :style="{ 'background-color': styless.buttonColor }"
            @click="_onClick"
        >
            <view class="fab-circle-v" :class="{ 'uni-fab__plus--active': isShow && content.length > 0 }"></view>
            <view class="fab-circle-h" :class="{ 'uni-fab__plus--active': isShow && content.length > 0 }"></view>
        </view>
    </view>
</template>

<script>
let platform = 'other';
// #ifdef APP-NVUE
platform = uni.getSystemInfoSync().platform;
// #endif

/**
 * Fab 悬浮按钮
 * @description 点击可展开一个图形按钮菜单
 * @tutorial https://ext.dcloud.net.cn/plugin?id=144
 * @property {Object} pattern 可选样式配置项
 * @property {Object} horizontal = [left | right] 水平对齐方式
 * 	@value left 左对齐
 * 	@value right 右对齐
 * @property {Object} vertical = [bottom | top] 垂直对齐方式
 * 	@value bottom 下对齐
 * 	@value top 上对齐
 * @property {Object} direction = [horizontal | vertical] 展开菜单显示方式
 * 	@value horizontal 水平显示
 * 	@value vertical 垂直显示
 * @property {Array} content 展开菜单内容配置项
 * @property {Boolean} popMenu 是否使用弹出菜单
 * @event {Function} trigger 展开菜单点击事件，返回点击信息
 * @event {Function} fabClick 悬浮按钮点击事件
 */
export default {
    name: 'UniFab',
    emits: ['fabClick', 'trigger'],
    props: {
        pattern: {
            type: Object,
            default() {
                return {};
            }
        },
        horizontal: {
            type: String,
            default: 'left'
        },
        vertical: {
            type: String,
            default: 'bottom'
        },
        direction: {
            type: String,
            default: 'horizontal'
        },
        content: {
            type: Array,
            default() {
                return [];
            }
        },
        show: {
            type: Boolean,
            default: false
        },
        popMenu: {
            type: Boolean,
            default: true
        },
        styles: {
            type: Object,
            default() {
                return {
                    color: '#3c3e49',
                    selectedColor: '#282C35',
                    backgroundColor: '#fff',
                    buttonColor: '#282C35'
                };
            }
        }
    },
    data() {
        return {
            fabShow: false,
            isShow: false,
            isAndroidNvue: platform === 'android',
            styless: null
        };
    },
    computed: {
        contentWidth(e) {
            return (this.content.length + 1) * uni.upx2px(80) + 10 + 'px';
        },
        contentWidthMin() {
            return uni.upx2px(80) + 'px';
        },
        // 动态计算宽度
        boxWidth() {
            return this.getPosition(3, 'horizontal');
        },
        // 动态计算高度
        boxHeight() {
            return this.getPosition(3, 'vertical');
        },
        // 计算左下位置
        leftBottom() {
            return this.getPosition(0, 'left', 'bottom');
        },
        // 计算右下位置
        rightBottom() {
            return this.getPosition(0, 'right', 'bottom');
        },
        // 计算左上位置
        leftTop() {
            return this.getPosition(0, 'left', 'top');
        },
        rightTop() {
            return this.getPosition(0, 'right', 'top');
        },
        flexDirectionStart() {
            return this.getPosition(1, 'vertical', 'top');
        },
        flexDirectionEnd() {
            return this.getPosition(1, 'vertical', 'bottom');
        },
        horizontalLeft() {
            return this.getPosition(2, 'horizontal', 'left');
        },
        horizontalRight() {
            return this.getPosition(2, 'horizontal', 'right');
        }
    },
    watch: {
        pattern(newValue, oldValue) {
            //console.log(JSON.stringify(newValue))
            this.styless = Object.assign({}, this.styles, newValue);
        }
    },
    created() {
        this.isShow = this.show;
        if (this.top === 0) {
            this.fabShow = true;
        }
        // 初始化样式
        this.styless = Object.assign({}, this.styles, this.pattern);
    },
    methods: {
        _onClick() {
            this.$emit('fabClick');
            if (!this.popMenu) {
                return;
            }
            this.isShow = !this.isShow;
        },
        open() {
            this.isShow = true;
        },
        close() {
            this.isShow = false;
        },
        /**
         * 按钮点击事件
         */
        _onItemClick(index, item) {
            this.$emit('trigger', {
                index,
                item
            });
        },
        /**
         * 获取 位置信息
         */
        getPosition(types, paramA, paramB) {
            if (types === 0) {
                return this.horizontal === paramA && this.vertical === paramB;
            } else if (types === 1) {
                return this.direction === paramA && this.vertical === paramB;
            } else if (types === 2) {
                return this.direction === paramA && this.horizontal === paramB;
            } else {
                return this.isShow && this.direction === paramA ? this.contentWidth : this.contentWidthMin;
            }
        }
    }
};
</script>

<style lang="scss" scoped>
.uni-fab {
    position: fixed;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    justify-content: center;
    align-items: center;
    z-index: 10;
}

.uni-cursor-point {
    /* #ifdef H5 */
    cursor: pointer;
    /* #endif */
}

.uni-fab--active {
    opacity: 1;
}

.uni-fab--leftBottom {
    left: 5px;
    bottom: 120px;
    /* #ifdef H5 */
    left: calc(5px + var(--window-left));
    bottom: calc(120px + var(--window-bottom));
    /* #endif */
    padding: 10px;
}

.uni-fab--leftTop {
    left: 5px;
    top: 30px;
    /* #ifdef H5 */
    left: calc(5px + var(--window-left));
    top: calc(30px + var(--window-top));
    /* #endif */
    padding: 10px;
}

.uni-fab--rightBottom {
    right: 5px;
    bottom: 120px;
    /* #ifdef H5 */
    right: calc(5px + var(--window-right));
    bottom: calc(120px + var(--window-bottom));
    /* #endif */
    padding: 10px;
}

.uni-fab--rightTop {
    right: 5px;
    top: 30px;
    /* #ifdef H5 */
    right: calc(5px + var(--window-right));
    top: calc(30px + var(--window-top));
    /* #endif */
    padding: 10px;
}

.uni-fab__circle {
    position: fixed;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    justify-content: center;
    align-items: center;
    width: 80upx;
    height: 80upx;
    background-color: #3c3e49;
    border-radius: 55px;
    z-index: 11;
}

.uni-fab__circle--leftBottom {
    left: 15px;
    bottom: 130px;
    /* #ifdef H5 */
    left: calc(15px + var(--window-left));
    bottom: calc(130px + var(--window-bottom));
    /* #endif */
}

.uni-fab__circle--leftTop {
    left: 15px;
    top: 40px;
    /* #ifdef H5 */
    left: calc(15px + var(--window-left));
    top: calc(40px + var(--window-top));
    /* #endif */
}

.uni-fab__circle--rightBottom {
    right: 15px;
    bottom: 130px;
    /* #ifdef H5 */
    right: calc(15px + var(--window-right));
    bottom: calc(130px + var(--window-bottom));
    /* #endif */
}

.uni-fab__circle--rightTop {
    right: 15px;
    top: 40px;
    /* #ifdef H5 */
    right: calc(15px + var(--window-right));
    top: calc(40px + var(--window-top));
    /* #endif */
}

.uni-fab__circle--left {
    left: 0;
}

.uni-fab__circle--right {
    right: 0;
}

.uni-fab__circle--top {
    top: 0;
}

.uni-fab__circle--bottom {
    bottom: 0;
}

.uni-fab__plus {
    font-weight: bold;
}

.fab-circle-v {
    position: absolute;
    width: 6upx;
    height: 42upx;
    left: 38.8upx;
    top: 20upx;
    background-color: white;
    transform: rotate(0deg);
    transition: transform 0.3s;
}

.fab-circle-h {
    position: absolute;
    width: 42upx;
    height: 6upx;
    left: 20upx;
    top: 39upx;
    background-color: white;
    transform: rotate(0deg);
    transition: transform 0.3s;
}

.uni-fab__plus--active {
    transform: rotate(135deg);
}

.uni-fab__content {
    /* #ifndef APP-NVUE */
    box-sizing: border-box;
    display: flex;
    /* #endif */
    flex-direction: row;
    border-radius: 55px;
    overflow: hidden;
    transition-property: width, height;
    transition-duration: 0.2s;
    width: 80upx;
    border-color: #dddddd;
    border-width: 1upx;
    border-style: solid;
}

.uni-fab__content--other-platform {
    border-width: 0px;
    box-shadow: 0 0 5px 2px rgba(0, 0, 0, 0.2);
}

.uni-fab__content--left {
    justify-content: flex-start;
}

.uni-fab__content--right {
    justify-content: flex-end;
}

.uni-fab__content--flexDirection {
    flex-direction: column;
    justify-content: flex-end;
}

.uni-fab__content--flexDirectionStart {
    flex-direction: column;
    justify-content: flex-start;
}

.uni-fab__content--flexDirectionEnd {
    flex-direction: column;
    justify-content: flex-end;
}

.uni-fab__item {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 80upx;
    height: 80upx;
    opacity: 0;
    transition: opacity 0.2s;
}

.uni-fab__item--active {
    opacity: 1;
}

.uni-fab__item-image {
    width: 25px;
    height: 25px;
    margin-bottom: 3px;
}

.uni-fab__item-text {
    color: #ffffff;
    font-size: 12px;
}

.uni-fab__item--first {
    width: 80upx;
}
</style>
